Strange scans - inquisitive question

[paul.rogers () MIS-CDS COM (Paul Rogers)]

Hi,

Last night we received some strange scans with a source port of 21 (ftp) and
a destination port of 7 (echo). The destination address was always the
network address. I was just wondering if anyone else had seen these scans or
whether anyone knew what they were looking for. The scans were performed
over TCP (protocol 6) and UDP (protocol 17).

I have a theory that the 64.79.80.26 (pm001-026.dialup.bignet.net) may be
the dialup account of the scanner and the rest of the hosts are compromised
systems being used by himself / herself, and the scan from the bignet.net
system was an accident.

If anyone can shed any light, it would be greatly appreciated because I'm
now very interested to discover what they were trying to achieve. Snippets
of the logs are below:

24.165.238.133 (RRCentralFlorida-165.238.133.cfl.rr.com) - duration of 32
minutes

Jun  8 04:32:32 xxxxxxx kernel: Packet log: input DENY eth2 PROTO=17
24.165.238.133:21 xxx.xxx.8.0:7 L=93 S=0x00 I=10061 F=0x4000 T=243 (#67)
Jun  8 04:32:32 xxxxxxx kernel: Packet log: input DENY eth2 PROTO=6
24.165.238.133:21 xxx.xxx.8.0:7 L=105 S=0x00 I=10063 F=0x4000 T=243 SYN
(#67)

193.226.98.26 (dnt-gw.dnttm.ro) - duration of 5 minutes (note - source port
is random)

Jun  8 15:16:43 xxxxxxx kernel: Packet log: input DENY eth2 PROTO=17
193.226.98.26:58001 xxx.xxx.8.0:7 L=1027 S=0x00 I=5275 F=0x0000 T=239 (#67)

64.79.80.26 (pm001-026.dialup.bignet.net) - duration of 4 minutes

Jun  8 20:05:38 xxxxxxx kernel: Packet log: input DENY eth2 PROTO=6
64.79.80.26:21 xxx.xxx.8.0:7 L=105 S=0x00 I=26126 F=0x4000 T=243 SYN (#68)
Jun  8 20:05:38 xxxxxxx kernel: Packet log: input DENY eth2 PROTO=17
64.79.80.26:21 xxx.xxx.8.0:7 L=93 S=0x00 I=26127 F=0x4000 T=243 (#68)

140.174.186.2 (televolve-T1-gw.san-francisco.best.net) - duration of 4 hours
30 minutes

Jun  9 00:00:50 xxxxxxx kernel: Packet log: input DENY eth2 PROTO=17
140.174.186.2:21 xxx.xxx.8.0:7 L=93 S=0x00 I=46897 F=0x4000 T=243 (#68)
Jun  9 00:00:50 xxxxxxx kernel: Packet log: input DENY eth2 PROTO=6
140.174.186.2:21 xxx.xxx.8.0:7 L=105 S=0x00 I=46896 F=0x4000 T=243 SYN (#68)

Many thanks,

Paul Rogers,
Network Security Analyst.

MIS Corporate Defence Solutions Limited

Tel:            +44 (0)1622 723422 (Direct Line)
                +44 (0)1622 723400 (Switchboard)
Fax:            +44 (0)1622 728580
Website:        http://www.mis-cds.com/

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